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https://github.com/logos-messaging/nim-ffi.git
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c51f313cd2
An Android library module wrapping the timer library's native ABI behind an idiomatic Kotlin `TimerNode` class via a JNI shim. `build-libs.sh` cross-compiles two native libraries per ABI (arm64-v8a + x86_64) into src/main/jniLibs/: libmy_timer.so (the Nim library) and libmy_timer_jni.so (the JNI bridge, which NEEDs the former). The shim turns each Kotlin `external fun` into a blocking call and reads the typed EchoResponse struct out of the result callback. Gradle packages everything under jniLibs/ automatically; an instrumented test covers create/version/echo on a device/emulator. Native build validated for both ABIs (correct aarch64/x86_64 ELF, JNI symbols exported, libmy_timer.so linked). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
51 lines
2.0 KiB
Bash
Executable File
51 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Cross-compile the native libraries for Android and stage them under
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# src/main/jniLibs/<abi>/, so Gradle packages them into the AAR/APK:
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# - libmy_timer.so the Nim timer library (native C ABI)
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# - libmy_timer_jni.so the JNI shim that bridges it to Kotlin
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#
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# Requires the Android NDK (set ANDROID_NDK_ROOT, or it falls back to the
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# Homebrew location) and Nim. Builds arm64-v8a + x86_64 by default (real devices
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# and the emulator); add rows to the table below for more ABIs.
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#
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# ./build-libs.sh
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set -euo pipefail
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HERE="$(cd "$(dirname "$0")" && pwd)"
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REPO_ROOT="$(cd "$HERE/../../.." && pwd)"
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NIM_SRC="$REPO_ROOT/examples/timer/timer.nim"
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HDR_DIR="$REPO_ROOT/examples/timer/c_bindings"
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JNILIBS="$HERE/src/main/jniLibs"
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NDK="${ANDROID_NDK_ROOT:-/opt/homebrew/share/android-ndk}"
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API="${ANDROID_API:-21}"
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HOST_TAG="$(ls "$NDK/toolchains/llvm/prebuilt" | head -1)"
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TC="$NDK/toolchains/llvm/prebuilt/$HOST_TAG"
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build_abi() { # <abi> <nim-cpu> <ndk-triple>
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local abi="$1" cpu="$2" triple="$3"
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local cc="$TC/bin/${triple}${API}-clang"
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local out="$JNILIBS/$abi"
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echo ">> $abi"
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mkdir -p "$out"
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# 1) the Nim library (native C ABI)
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( cd "$REPO_ROOT" && nim c --mm:orc -d:release -d:chronicles_log_level=WARN \
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--threads:on --os:android --cpu:"$cpu" --cc:clang \
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--clang.exe:"$cc" --clang.linkerexe:"$cc" \
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--app:lib --noMain --nimMainPrefix:libmy_timer \
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--nimcache:"$HERE/.nimcache/$abi" \
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-o:"$out/libmy_timer.so" "$NIM_SRC" >/dev/null )
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# 2) the JNI shim, linked against the Nim library
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"$cc" -shared -fPIC -O2 -I"$HDR_DIR" "$HERE/jni/my_timer_jni.c" \
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-L"$out" -lmy_timer -o "$out/libmy_timer_jni.so"
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echo " $(cd "$out" && echo *.so)"
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}
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test -x "$TC/bin/aarch64-linux-android${API}-clang" \
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|| { echo "NDK not found at $NDK (set ANDROID_NDK_ROOT)"; exit 1; }
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rm -rf "$JNILIBS"
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build_abi arm64-v8a arm64 aarch64-linux-android
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build_abi x86_64 amd64 x86_64-linux-android
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echo ">> done -> src/main/jniLibs/"
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